Best FI BTL Port Frequency?

[crfrider 10+ year member]

A Yes Im wanting to know what the best port size and frequency would be best for a 18 INch FI BTL, i know they shine at low frequencys but what about higher ones like 38HZ?

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[Pioneer~Saturn 5,000+ posts]

What are you looking to get out of it?...

 

[dappa5 10+ year member]

what is the best feq for your vehicle have you tested it yet???

 

[crfrider 10+ year member]

well i dont have the sub yet, im just tryin to decide if i want a FI 18 and im trying to decide if i want it higher sounding, im usally wanting low but i think i may try a SQ setup, still lower but also has good highs, I have a Chevy EX-Cab silverado